update to accommodate latest clang in chrome toolchain

remove asserts for null pointers to references
change var args signature to pointer instead of array

R=mtklein@google.com, reed@android.com, reed@google.com, mtklein, reed

Author: caryclark@google.com

Review URL: https://codereview.chromium.org/577243002
diff --git a/include/views/SkOSMenu.h b/include/views/SkOSMenu.h
index 8801a52..7325418 100644
--- a/include/views/SkOSMenu.h
+++ b/include/views/SkOSMenu.h
@@ -129,7 +129,7 @@
      */
     int appendAction(const char label[], SkEventSinkID target);
     int appendList(const char label[], const char slotName[],
-                   SkEventSinkID target, int defaultIndex, const char[] ...);
+                   SkEventSinkID target, int defaultIndex, const char* ...);
     int appendSlider(const char label[], const char slotName[],
                      SkEventSinkID target, SkScalar min, SkScalar max,
                      SkScalar defaultValue);